INFLUENCE OF THE INTERNAL PHOTOINDUCED ELECTRIC-FIELD ON THE FORMATION OF SELF-PUMPED PHASE-CONJUGATION IN DOPED (K0.5NA0.5)(0.2)(SR0.75BA0.25)(0.9)NB2O6

The obvious influence of the internal photoinduced electric field on t he formation of self-pumped phase conjugation in doped (K0.5Na0.5)(0.2 )(Sr0.75Ba0.25)(0.9)Nb2O6 crystals has been investigated with intermit tent and continuous laser beams. An analysis is given that involves th e migration of charge carriers driven by the photovoltaic (PV) and the pyroelectric (PY) electric field. Deviation from the optimal state of energy transfer owing to the PV effect and the self-adjusting of holo grams owing to the PY field are the two important dominant processes i n the self-pumped phase conjugator. The influence of the photoinduced electric field on the conjugation fidelity and the stability of the ph ase-conjugate output is also observed and analyzed. The bump feature o f the two-wave mixing and the oscillating situation of the self-pumped phase conjugator are observed and are explained in view of the photoi nduced internal field. (C) 1996 Optical Society of America